Is it normal for the upper hose to be hot and the lower hose to be cool with the fan running on a Vios?

[ReaganFitz]

It is abnormal for the upper hose to be hot and the lower hose to be cool with the fan running on a Vios. If both the upper and lower hoses are hot, it indicates a problem with the radiator or the fan. Under normal circumstances, the upper hose of the radiator should be hot, while the lower hose should not be, as one is responsible for water intake and the other for outflow. Here is some relevant information about the car radiator: 1. Introduction: The car radiator generally refers to the heat exchanger (automobile radiator). The radiator is part of the car's cooling system, and the radiator in the engine's water cooling system consists of three parts: the inlet chamber, the outlet chamber, the main plate, and the radiator core. 2. Installation methods: Radiators can be installed in three ways: same-side inlet and outlet, opposite-side inlet and outlet, and bottom inlet and outlet. Regardless of the method, the number of pipe fittings should be minimized, as more fittings not only increase costs but also potential risks.